<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>  


        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

            <!-- 步骤条区域 -->
            <el-steps :active="activeIndex - 0" align-center finish-status="success">
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
            </el-steps>
            

            <!-- tabs 栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="brforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                         <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                         <el-form-item label="商品价格" prop="goods_price">
                            <el-input type="number" v-model="addForm.goods_price"></el-input>
                        </el-form-item>
                         <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number" ></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number" ></el-input>
                        </el-form-item>
                         <el-form-item label="商品分类" prop="goods_cat">
                           <el-cascader
                            v-model="addForm.goods_cat"
                            :options="catesList"
                            :props="cateProps"
                            expandTrigger="hover"
                            @change="handleChange"
                            ></el-cascader>
                        </el-form-item>
                         
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的 Item项 -->
                        <el-form-item :label="item.attr_name" v-for="(item,idx) in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="i" v-for="(i,index) in item.attr_vals" :key="index"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 图片要上传的 api 接口地址 -->
                        <el-upload
                        :headers="headerObj"
                        :on-success="handleSuccess"
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture">
                        <el-button size="small" type="primary">点击上传</el-button>
                        <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 quill-editor -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button class="btnAdd" @click="add" type="primary">添加商品</el-button>
                    </el-tab-pane>
                    
                </el-tabs>
            </el-form> 
        </el-card>

    <!-- 图片预览框 -->
    <el-dialog
    title="预览图片"
    :visible.sync="previewDialogVisible"
    width="50%"
    >
    <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex:'0',
            //添加表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                goods_cat:[],//商品所属分类数组
                pics:[],//上传图片的数组
                goods_introduce:'',//商品的详情描述
                attrs:[]
            },
            //输入内容的校验规则
            addFormRules:{
                goods_name:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_price:[
                    { required: true, message: '请输入商品价格', trigger: 'blur' },
                ],
                goods_weight:[
                    { required: true, message: '请输入商品重量', trigger: 'blur' },
                ],
                goods_number:[
                    { required: true, message: '请输入商品数量', trigger: 'blur' },
                ],
                 goods_cat:[
                    { required: true, message: '请选择商品分类', trigger: 'blur' },
                ]
            },
            catesList:[],//商品分类列表
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            manyTableData:[],//动态参数列表数据
            onlyTableData:[],//静态参数列表数据
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',//上传图片的URL地址
            //图片上传组件的 headers请求头
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',//羽然图片的地址url
            previewDialogVisible:false,//预览图片的弹框
        }
    },
    created() {
        this.getCateList();
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length == 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    },
    methods: {
        //获取所有商品分类列表
        async getCateList(){
            const {data:res} = await this.$http.get(`categories`);
            if(res.meta.status !== 200){
                return this.$message.error(res.meta.msg);
            }else{
                this.$message.success(res.meta.msg);
                this.catesList = res.data;
            }
        },
        //级联选择器选中项变化，会触发这个函数
        handleChange(){
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = [];
            }        
        },
        brforeTabLeave(activeName,oldActiveName){
            console.log('离开',oldActiveName);
            console.log('进入',activeName);
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类！');
                return false;
            }
        },
        async tabClicked(){
            console.log(this.activeIndex);
            //证明访问的是动态参数面板
            if(this.activeIndex ==='1'){
                const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel:'many'
                    }
                });
                if(res.meta.status !== 200){
                    return this.$message.error(res.meta.msg);
                }else{
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length>0?item.attr_vals.split(','):[]
                    });
                    this.manyTableData = res.data;
                    this.$message.success(res.meta.msg);
                }
            }else if(this.activeIndex ==='2'){
                const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel:'only'
                    }
                });
                if(res.meta.status !== 200){
                    return this.$message.error(res.meta.msg);
                }else{
                    this.onlyTableData = res.data;
                    console.log(' this.onlyTableData', this.onlyTableData);
                    this.$message.success(res.meta.msg);
                }
            }
        },
        //处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url;
            this.previewDialogVisible = true;
        },
        //处理移除图片的操作
        handleRemove(file){
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path;
            // 2.从pics 数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x=>x.pic === filePath);
            // 3.调用数组的splice方法，把图片信息对象，从pics 数组中移除
            this.addForm.pics.splice(i,1);
            console.log('this.addForm.pics',this.addForm.pics);
        },
        //监听图片上传成功的事件
        handleSuccess(response){
            if(response.meta.status !== 200){
                this.$message.error(response.meta.msg);
            }else{
                // 1.拼接得到一个图片信息对象
                const picInfo = {pic:response.data.tmp_path};
                // 2.将图片信息对象，push到pics数组中
                this.addForm.pics.push(picInfo);
                console.log(' this.addForm.pics', this.addForm.pics);
                this.$message.success(response.meta.msg);
            }
            console.log('response',response.data.tmp_path);
        },
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async vail=>{
                if(!vail){
                    return this.$message.error('请填写必要的表单项！');
                }else{
                    //执行添加的业务逻辑
                    //lodash  cloneDeep(obj)
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',');
                    // 处理动态参数
                    this.manyTableData.forEach(item=>{
                        const newInfo = {
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals.join(' '),
                        };
                        this.addForm.attrs.push(newInfo);
                    })
                    // 处理静态属性
                    this.manyTableData.forEach(item=>{
                        const newInfo = {
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals.join(' '),
                        };
                        this.addForm.attrs.push(newInfo);
                    })
                    form.attrs = this.addForm.attrs;
                    console.log('form',form);

                    //发起请求添加商品
                    //商品名称，必须是唯一的
                    const {data:res} = await this.$http.post(`goods`,form);
                    if(res.meta.status !== 201){
                        return this.$message.error(res.meta.msg);
                    }else{
                        this.$message.success(res.meta.msg);
                        this.$router.push(`/goods`)
                    }
                }
            })
            console.log('this.addForm',this.addForm);
        }
    },
            

}
</script>

<style scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top:15px;
}
</style>